Could reproduce in Version 4.2.0a1 (e507cb846753)

To reproduce:
- Open attached project "AudioMemoryUsage.unitypackage" and launch "test" scene
- Open Profiler
- Select the "skrillex" audio file and change the Load Type to "Stream from Disc"
- Hit Play and observe the Audio Memory Usage in Profiler
- Select the "skrillex" audio file again and change the Load Type to "Load into memory"
- Hit Play and observe that the Audio Memory Usage in Profiler is the same as before